Friction-brake.



Patentad Oct. 2, |900.

F. N. H. W. WHITCONB.

Fmclon sans.

(Anuman led Feb. 9, 19001) (No Nudel.)

FIG.2.

UNITED-- STATES ATENT OFFICE.

FRIEND N. WHITCOMB AND HARRY WENDELL WHITCOMB, OF BARRE,

` VERMONT.

FRICTION-BRAKE.

SPECIFICATION forming part of Letters Patent No. 659,1 15. dated October 2, 1900 Original application iledDecember 22, 1898, Serial No, 700,025. ADivided and this application filed February 9, 1900. Serial No. 4,022. kNo model.)

To a/ZZ whom it may concern:

Be it known that we, FRIEND N. WHIT- ooMB and HARRY WENDELL WHITCOMB, citizens of the United States, and residents of Barre, in the county of Washington and State of Vermont, have in vented a new and Improved Friction-B rake, of which the following is. a full, clear, and exact description, this being adivision of the application for Letters Patent of the United States for power-capstan, Serial No. 700,025, tiled by us on'December 22, 1898.

The object of the invention is to provide a new and improved friction-brake designed for use on power-capstans and other machinery and which is simple and durable in construc.

tion, very eective in operation, and arranged to insure a uniform application of the frictional power and to allow of conveniently repairing the brake whenever necessary.

The invention consists of novel features and parts and combinations of the same, as,

will be fullydescribed hereinafter and then pointed out in the claims.

A practical embodiment of the invention is represented in the accompanying drawings, forming a part of this specification, in' which similar characters of reference indicate corresponding parts in both the views.

Figure 1 is a side elevation of the improvement with parts in section and a applied to a power-capstan, and Fig. 2 is a transverse section of the same.

The improved friction-brake mechanism illustrated in the drawings is applied to 'a power-capstan mountedon a bed A and having a transversely-extendingdriven shaft B, carrying a pinion B', in mesh with two gearwheels C, secured onl transverse shafts D, and each having a fliction-vheelC', adapted to be engaged by beveled-'blocks F' on a hoisting-drum F, mounted to turn loosely on said shaft D, and adapted to be shifted transverselyto move the blocks F into frictional contactwith the wheels C or to move the blocks out of engagement with the same by a special positive mechanism under the control of the operator and moreN fully shown and described in the application above referred to, so thatl further description of the same is not deemed necessary.

The brake mechanism presently to be describedin detail is designed to brake the drum F while the blocks F are disengaged from the wheel O, and for this purpose the forward end of the drum F carries a brakewheel G, adapted to be engaged at its inner face by brake-blocks H, dovetailed in a split ring I, 'extending within said wheel G. A shaft J is journaled in one end of said split ring I and is also journaled in a bearing A' carried by the bed A, and on this shaft J is se ired an eccentric K, abutting against the other free end of the split ring I, so that when theshaft J is tu'rne'dthe sadceccentrcrK opens the ring and moves the friction-blocks H in firm contact with the inner face of the brake-wheel G to brake the latter, and consequently the drum F. V

As indicated at the left in Fig. 2, the end of the split ring I, carrying the shaft J, is formed into a fork I to receive the eccentric K between the fork members.l On the outer end of the shaft J is secured an arm L, connected by a link N with a lever or other mechanism (not shown) and under the control of the operatorto enable the latter to imparta swinging motion to the arm Lto turn tl: 3 shaftJ and cause the eccentric K to open the ring I for the purpose mentioned to allow thering I to close by its own resiliency when it ir desired to disengage the friction-blocks H from the friction-wheel G.

From the foregoing it is evident that the drum F can be readily braked at any time by the operator turning the shaft J to open or close the ring I and move the blocks H in or out of engagement with the wheel G.

Although we have described the arrangement in connection with a hoisting-machine, it is evident that the brake mechanism, may beutilizedin other machines, and hence we do not limit ourselves to-the particular combination of the improvement with ahoistingmachine, and it is further evident that other means-such, for instance, as a wedge or screwmay be employed to open the brakeyband for expansion against and braking ofthe brake-wheel.

l Having thus fully described our invention, we claim as new and desire to secure by' Letters Patenty l. A brake mechanism, comprising abralewheel, a split brake-ring, and an eccentric mounted in one end of the ring with its working face projecting beyond the same and into engagement with the other end ofthe said ring, substantially as and for the purpose set forth.

2. A brake mechanism, comprisinga brakewheel, a split brake-ring carrying blocks for engaging said brake-wheel, an eccentric for opening said split ring, to move the blocks in frictional contact with said brake-Wheel, and a shaft under the control of the operator and journaled in one end of said split ring, the shaft carrying .the eccentric and the latter having its working face projecting beyond the end of the rinf,r and abutting against the other end of said ring, substantially as shown and described.

3. A brake mechanism, comprisingaJ brakewheel, a split brake ring having one end forked and carrying brake-blocks on its outer face for engaging the brake-wheel, a shaft mounted in the forked end ofthe ring, means for operating the shaft, and an eccentric secured to the shaft between the members of the forkof the ring, with its working face projecting beyond the end of said ring, substantially as herein shown and described.

In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses.

FRIEND N. WHI'TCOMB. HARRY WENDELL WHITOOMB.

Witnesses: y

RICHARD A. Hom, MATTIE E. PRICE. 

